What is grief/suffering due to?
One not being able to get what is wanted or to lose what is had. But if he knows that the waking experience is mere mirage, and that all the wealth, women and luxuries he had, and which was lost has gone back to Ataman, the true self, therefore how can he feel sorry. If one grieves it is because he wrongly felt it has gone into somebody else.
The idea of loss, the object or person lost, all go back into the soul. Hence a Gnani does not grieve. This is foolishly applied to practical life, when people have an idea, that I am a separate being from others; only for a Gnani is loss not real loss. Unless one has realized, one should be practical in viewing loss. When one forgets everything, he doesn’t grieve over it. When one know that memory is an idea, and then the misery it may bring him is nullified.
All unhappiness brought by the memory of the past, is found in the mind; Gnani evacuates it as idea and is not moved. When one knows Ataman/soul to be all-pervading, he becomes aware of the fact that Atman alone is real all else is mirage.
So long as there is waking, there is thinking. Think always of the fact that everything in past, present and future is created out of Ataman. Imagination of past and future appears as real to unenlightened until they awaken. Then they see it is all imagination. To ignorant waking experience seems real, to Gnani the waking is mere mirage.